*{
    box-sizing: border-box;
}
html,body{
    width: 100%;
    height: 100%;
    padding: 0;
    margin: 0;
}
body{
    padding: 15px;
}
.callout{
    width: 100%;
    padding: 15px;
    border: 1px solid #F5F5F5;
    border-left: 5px solid #0097ee;
    font-size: 16px;
    border-radius: 3px;
    background-color: #FAFAFA;
}
h1.callout{
    font-size: 19px;
    font-weight: 500;
    padding: 8px 15px;
}